change return error code

diff --git a/src/regparse.c b/src/regparse.c
index fb2cdbb1af8ae75fdc3a7bdb6211db690c20503b..e90a8f739e01625cb15051893e0df42c301af1b4 100644 (file)
--- a/src/regparse.c
+++ b/src/regparse.c
@@ -5628,7 +5628,7 @@ fetch_token(PToken* tok, UChar** src, UChar* end, ScanEnv* env)
               tok->u.call.gnum      = 0;
               tok->u.call.name      = p;
               PINC;
-              if (! PPEEK_IS(')')) return ONIGERR_INVALID_GROUP_NAME;
+              if (! PPEEK_IS(')')) return ONIGERR_UNDEFINED_GROUP_OPTION;
               tok->u.call.name_end  = p;
               break;